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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ParseUtil.HasNamePredicate.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.parse;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.base.Predicate;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import com.google.common.collect.Iterables;<a name="line.11"></a>
<span class="sourceLineNo">012</span><a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.NoSuchElementException;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.jsimpledb.JClass;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.jsimpledb.JField;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import org.jsimpledb.core.Field;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import org.jsimpledb.core.ObjId;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import org.jsimpledb.core.ObjType;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import org.jsimpledb.core.SchemaItem;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import org.jsimpledb.core.UnknownTypeException;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.jsimpledb.parse.util.PrefixPredicate;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.jsimpledb.parse.util.StripPrefixFunction;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>/**<a name="line.25"></a>
<span class="sourceLineNo">026</span> * Parsing utility routines.<a name="line.26"></a>
<span class="sourceLineNo">027</span> */<a name="line.27"></a>
<span class="sourceLineNo">028</span>public final class ParseUtil {<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>    private ParseUtil() {<a name="line.30"></a>
<span class="sourceLineNo">031</span>    }<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>    /**<a name="line.33"></a>
<span class="sourceLineNo">034</span>     * Truncate a string with ellipsis if necessary.<a name="line.34"></a>
<span class="sourceLineNo">035</span>     *<a name="line.35"></a>
<span class="sourceLineNo">036</span>     * @param string original string<a name="line.36"></a>
<span class="sourceLineNo">037</span>     * @param len maximum length beyond which to truncate<a name="line.37"></a>
<span class="sourceLineNo">038</span>     * @return truncated string<a name="line.38"></a>
<span class="sourceLineNo">039</span>     */<a name="line.39"></a>
<span class="sourceLineNo">040</span>    public static String truncate(String string, int len) {<a name="line.40"></a>
<span class="sourceLineNo">041</span>        if (len &lt; 4)<a name="line.41"></a>
<span class="sourceLineNo">042</span>            throw new IllegalArgumentException("len = " + len + " &lt; 4");<a name="line.42"></a>
<span class="sourceLineNo">043</span>        if (string.length() &lt;= len)<a name="line.43"></a>
<span class="sourceLineNo">044</span>            return string;<a name="line.44"></a>
<span class="sourceLineNo">045</span>        return string.substring(0, len - 3) + "...";<a name="line.45"></a>
<span class="sourceLineNo">046</span>    }<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span>    /**<a name="line.48"></a>
<span class="sourceLineNo">049</span>     * Generate completions based on a set of possibilities and the provided input prefix.<a name="line.49"></a>
<span class="sourceLineNo">050</span>     *<a name="line.50"></a>
<span class="sourceLineNo">051</span>     * @param choices possible choices<a name="line.51"></a>
<span class="sourceLineNo">052</span>     * @param prefix prefix input so far<a name="line.52"></a>
<span class="sourceLineNo">053</span>     * @return possible completions<a name="line.53"></a>
<span class="sourceLineNo">054</span>     */<a name="line.54"></a>
<span class="sourceLineNo">055</span>    public static Iterable&lt;String&gt; complete(Iterable&lt;String&gt; choices, String prefix) {<a name="line.55"></a>
<span class="sourceLineNo">056</span>        return Iterables.transform(Iterables.filter(choices, new PrefixPredicate(prefix)), new StripPrefixFunction(prefix));<a name="line.56"></a>
<span class="sourceLineNo">057</span>    }<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>    /**<a name="line.59"></a>
<span class="sourceLineNo">060</span>     * Locate the {@link JField} with the given name in the specified object.<a name="line.60"></a>
<span class="sourceLineNo">061</span>     *<a name="line.61"></a>
<span class="sourceLineNo">062</span>     * @param session current session<a name="line.62"></a>
<span class="sourceLineNo">063</span>     * @param id object ID<a name="line.63"></a>
<span class="sourceLineNo">064</span>     * @param name field name<a name="line.64"></a>
<span class="sourceLineNo">065</span>     * @return the specified field<a name="line.65"></a>
<span class="sourceLineNo">066</span>     * @throws IllegalArgumentException if object does not exist<a name="line.66"></a>
<span class="sourceLineNo">067</span>     * @throws IllegalArgumentException if object's type does not exist in schema<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * @throws IllegalArgumentException if field is not found<a name="line.68"></a>
<span class="sourceLineNo">069</span>     * @throws IllegalArgumentException if any parameter is null<a name="line.69"></a>
<span class="sourceLineNo">070</span>     */<a name="line.70"></a>
<span class="sourceLineNo">071</span>    public static JField resolveJField(ParseSession session, ObjId id, String name) {<a name="line.71"></a>
<span class="sourceLineNo">072</span><a name="line.72"></a>
<span class="sourceLineNo">073</span>        // Sanity check<a name="line.73"></a>
<span class="sourceLineNo">074</span>        if (session == null)<a name="line.74"></a>
<span class="sourceLineNo">075</span>            throw new IllegalArgumentException("null session");<a name="line.75"></a>
<span class="sourceLineNo">076</span>        if (id == null)<a name="line.76"></a>
<span class="sourceLineNo">077</span>            throw new IllegalArgumentException("null id");<a name="line.77"></a>
<span class="sourceLineNo">078</span>        if (name == null)<a name="line.78"></a>
<span class="sourceLineNo">079</span>            throw new IllegalArgumentException("null name");<a name="line.79"></a>
<span class="sourceLineNo">080</span>        if (!session.hasJSimpleDB())<a name="line.80"></a>
<span class="sourceLineNo">081</span>            throw new IllegalArgumentException("this session has no JSimpleDB");<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span>        // Get object type<a name="line.83"></a>
<span class="sourceLineNo">084</span>        final ObjInfo info = ObjInfo.getObjInfo(session, id);<a name="line.84"></a>
<span class="sourceLineNo">085</span>        if (info == null)<a name="line.85"></a>
<span class="sourceLineNo">086</span>            throw new IllegalArgumentException("error accessing field `" + name + "': object " + id + " does not exist");<a name="line.86"></a>
<span class="sourceLineNo">087</span>        final ObjType objType = info.getObjType();<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span>        // Find JClass<a name="line.89"></a>
<span class="sourceLineNo">090</span>        final JClass&lt;?&gt; jclass;<a name="line.90"></a>
<span class="sourceLineNo">091</span>        try {<a name="line.91"></a>
<span class="sourceLineNo">092</span>            jclass = session.getJSimpleDB().getJClass(objType.getStorageId());<a name="line.92"></a>
<span class="sourceLineNo">093</span>        } catch (UnknownTypeException e) {<a name="line.93"></a>
<span class="sourceLineNo">094</span>            throw new IllegalArgumentException("error accessing field `" + name + "': " + e.getMessage(), e);<a name="line.94"></a>
<span class="sourceLineNo">095</span>        }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span>        // Find JField<a name="line.97"></a>
<span class="sourceLineNo">098</span>        final JField jfield = jclass.getJFieldsByName().get(name);<a name="line.98"></a>
<span class="sourceLineNo">099</span>        if (jfield == null)<a name="line.99"></a>
<span class="sourceLineNo">100</span>            throw new IllegalArgumentException("error accessing field `" + name + "': there is no such field in " + objType);<a name="line.100"></a>
<span class="sourceLineNo">101</span>        return jfield;<a name="line.101"></a>
<span class="sourceLineNo">102</span>    }<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span>    /**<a name="line.104"></a>
<span class="sourceLineNo">105</span>     * Locate the field with the given name in the specified object.<a name="line.105"></a>
<span class="sourceLineNo">106</span>     *<a name="line.106"></a>
<span class="sourceLineNo">107</span>     * @param session current session<a name="line.107"></a>
<span class="sourceLineNo">108</span>     * @param id object ID<a name="line.108"></a>
<span class="sourceLineNo">109</span>     * @param name field name<a name="line.109"></a>
<span class="sourceLineNo">110</span>     * @return the specified field<a name="line.110"></a>
<span class="sourceLineNo">111</span>     * @throws IllegalArgumentException if object does not exist<a name="line.111"></a>
<span class="sourceLineNo">112</span>     * @throws IllegalArgumentException if field is not found<a name="line.112"></a>
<span class="sourceLineNo">113</span>     * @throws IllegalArgumentException if any parameter is null<a name="line.113"></a>
<span class="sourceLineNo">114</span>     */<a name="line.114"></a>
<span class="sourceLineNo">115</span>    public static Field&lt;?&gt; resolveField(ParseSession session, ObjId id, String name) {<a name="line.115"></a>
<span class="sourceLineNo">116</span><a name="line.116"></a>
<span class="sourceLineNo">117</span>        // Sanity check<a name="line.117"></a>
<span class="sourceLineNo">118</span>        if (session == null)<a name="line.118"></a>
<span class="sourceLineNo">119</span>            throw new IllegalArgumentException("null session");<a name="line.119"></a>
<span class="sourceLineNo">120</span>        if (id == null)<a name="line.120"></a>
<span class="sourceLineNo">121</span>            throw new IllegalArgumentException("null id");<a name="line.121"></a>
<span class="sourceLineNo">122</span>        if (name == null)<a name="line.122"></a>
<span class="sourceLineNo">123</span>            throw new IllegalArgumentException("null name");<a name="line.123"></a>
<span class="sourceLineNo">124</span><a name="line.124"></a>
<span class="sourceLineNo">125</span>        // Get object type<a name="line.125"></a>
<span class="sourceLineNo">126</span>        final ObjInfo info = ObjInfo.getObjInfo(session, id);<a name="line.126"></a>
<span class="sourceLineNo">127</span>        if (info == null)<a name="line.127"></a>
<span class="sourceLineNo">128</span>            throw new IllegalArgumentException("error accessing field `" + name + "': object " + id + " does not exist");<a name="line.128"></a>
<span class="sourceLineNo">129</span>        final ObjType objType = info.getObjType();<a name="line.129"></a>
<span class="sourceLineNo">130</span><a name="line.130"></a>
<span class="sourceLineNo">131</span>        // Find the field<a name="line.131"></a>
<span class="sourceLineNo">132</span>        try {<a name="line.132"></a>
<span class="sourceLineNo">133</span>            return Iterables.find(objType.getFields().values(), new HasNamePredicate(name));<a name="line.133"></a>
<span class="sourceLineNo">134</span>        } catch (NoSuchElementException e) {<a name="line.134"></a>
<span class="sourceLineNo">135</span>            throw new IllegalArgumentException("error accessing field `" + name + "': there is no such field in " + objType);<a name="line.135"></a>
<span class="sourceLineNo">136</span>        }<a name="line.136"></a>
<span class="sourceLineNo">137</span>    }<a name="line.137"></a>
<span class="sourceLineNo">138</span><a name="line.138"></a>
<span class="sourceLineNo">139</span>// HasNamePredicate<a name="line.139"></a>
<span class="sourceLineNo">140</span><a name="line.140"></a>
<span class="sourceLineNo">141</span>    /**<a name="line.141"></a>
<span class="sourceLineNo">142</span>     * Predicate matching {@link SchemaItem}s by name.<a name="line.142"></a>
<span class="sourceLineNo">143</span>     */<a name="line.143"></a>
<span class="sourceLineNo">144</span>    public static class HasNamePredicate implements Predicate&lt;SchemaItem&gt; {<a name="line.144"></a>
<span class="sourceLineNo">145</span><a name="line.145"></a>
<span class="sourceLineNo">146</span>        private final String name;<a name="line.146"></a>
<span class="sourceLineNo">147</span><a name="line.147"></a>
<span class="sourceLineNo">148</span>        /**<a name="line.148"></a>
<span class="sourceLineNo">149</span>         * Constructor.<a name="line.149"></a>
<span class="sourceLineNo">150</span>         *<a name="line.150"></a>
<span class="sourceLineNo">151</span>         * @param name item name<a name="line.151"></a>
<span class="sourceLineNo">152</span>         */<a name="line.152"></a>
<span class="sourceLineNo">153</span>        public HasNamePredicate(String name) {<a name="line.153"></a>
<span class="sourceLineNo">154</span>            this.name = name;<a name="line.154"></a>
<span class="sourceLineNo">155</span>        }<a name="line.155"></a>
<span class="sourceLineNo">156</span><a name="line.156"></a>
<span class="sourceLineNo">157</span>        @Override<a name="line.157"></a>
<span class="sourceLineNo">158</span>        public boolean apply(SchemaItem item) {<a name="line.158"></a>
<span class="sourceLineNo">159</span>            return item.getName().equals(this.name);<a name="line.159"></a>
<span class="sourceLineNo">160</span>        }<a name="line.160"></a>
<span class="sourceLineNo">161</span>    }<a name="line.161"></a>
<span class="sourceLineNo">162</span>}<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>




























































</pre>
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